diff --git a/src/video/vid_svga.c b/src/video/vid_svga.c
index 8f5907c3f..0c9c24241 100644
--- a/src/video/vid_svga.c
+++ b/src/video/vid_svga.c
@@ -1997,9 +1997,15 @@ svga_doblit(int wx, int wy, svga_t *svga)
 
     y_add   = enable_overscan ? svga->monitor->mon_overscan_y : 0;
     x_add   = enable_overscan ? svga->monitor->mon_overscan_x : 0;
+#ifdef USE_OLD_CALCULATION
     y_start = enable_overscan ? 0 : (svga->monitor->mon_overscan_y >> 1);
     x_start = enable_overscan ? 0 : (svga->monitor->mon_overscan_x >> 1);
     bottom  = (svga->monitor->mon_overscan_y >> 1);
+#else
+    y_start = enable_overscan ? 0 : svga->y_add;
+    x_start = enable_overscan ? 0 : svga->left_overscan;
+    bottom  = svga->monitor->mon_overscan_y - svga->y_add;
+#endif
 
     if (svga->vertical_linedbl) {
         y_add <<= 1;